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Q: What is centrifugal water pump efficiency? What is the formula?

A: The centrifugal water pump efficiency means the ratio between effective power and shaft power.η=Pe/P
Centrifugal water pump power usually means input power, that is too say the driven forwarded power to the pump shaft, so also call it shaft power. Use P to instead.
The efficient power means: pump head x weight flow rate x acceleration of gravity.
Pe=ρg QH (W) or Pe=γQH/1000 (KW)
ρ: Liquid density (kg/m3)
γ: Liquid weight (N/ m3)
g: Liquid acceleration of gravity(m/s)
Weight flow rate: Qm=ρQ (t/h or kg/s)
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